The bubble defect is one problem of plastic injection product.The cow mastitis syringe also appear this problem.Today I will tell some method to solve the bubble problem.
1.when the wall thickness of syringe is more thick,the cooling speed of syringes' surface is quicker than syringes' center,therefore,with syringe cooling,the center plastic is shrinking and expanding,in this way,the syringe center may be filled insufficient,then the syringe can produce bubble,this situation is called density bubble.The following method is solution.
2.according the wall thickness,ensure reasonable pouring gate and runner size.
3.leave enough supplement injection material untill sealing pouring gate
4.the injection time is longer than the time of sealing pouring gate
5.lower the injection speed,improve the injection pressure
6.use higher grade melt viscosity material
7.because the volatile gas cause the bubble,the following method is solution.
8.pre-drying adequately
9.lower the plastic temperature,avoid producing volatile gas
10.the bubble caused by bad liquidity,you can improve plastic material and mould temperature,improve the injection speed.
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